http://manuals.pqstat.pl/ 2026-04-07T12:12:22+00:00 http://manuals.pqstat.pl/ http://manuals.pqstat.pl/lib/tpl/dokuwiki/images/favicon.ico text/html 2022-02-12T16:17:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://manuals.pqstat.pl/en:statpqpl:porown2grpl:nparpl Non-parametric tests The Mann-Whitney U test The Mann-Whitney test is also called as the Wilcoxon Mann-Whitney test (Mann and Whitney (1947) and Wilcoxon (1949)). This test is used to verify the hypothesis that there is no shift in the compared distributions, i.e., most often the insignificance of differences between medians of an analysed variable in 2 populations (but you should assume that the distributions of a variable are pretty similar to each other - comparison of rank variances c… text/html 2022-02-12T16:17:19+00:00 Anonymous (anonymous@undisclosed.example.com) http://manuals.pqstat.pl/en:statpqpl:porown2grpl:parpl Parametric tests The Fisher-Snedecor test The F-Snedecor test is based on a variable which was formulated by Fisher (1924), and its distribution was described by Snedecor. This test is used to verify the hypothesis about equality of variances of an analysed variable for 2 populations.